Found our first eggs! Are they still good?

This is probably a dumb question. My 7 year old found 4 eggs this morning (he feels like a superhero now ) We have 2 chickens and they are free range in our backyard except at night when they are locked up tight. In theory these may not be the first eggs, and even if they are they could be a few days old. How do we tell if they are good to eat? Everyone is excited to try our firsts but I don't want anyone to get sick. Thanks!